Hello to everyone, great forum and some beautiful ovens from what i have seen so far. Starting a pizza oven on the backyard patio that is going to be a little smaller than i wanted but i figured if it works right we will all be happy with it. I had the area poured as part of the patio (8") and got the concrete block in last weekend. I'll probably be back with a few questions later.

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i was going by what i read in the A. Scott book for wood fired ovens which called for 2". I think i mentioned somewhere its going to be a small barrel type oven so i have a 3 1/2 slab over the vermiculite which i will lay down a bed of fire clay which will then be set with the firebrick, do you think i am going to have problems with insulation ?

You can build anyway you want, but having the insulation under the support slab has been pretty much discredited, unless you're going for massive bread bakes, and you fire every day, so heating up that much mass isn't as much an issue.

The advantage of the high mass oven is that you can do three bread bakes on one firing, and most of us want a quick heat up after work to cook pizzas.

It all depends on what you want, but the overwhelming majority of builders put a single layer of firebrick over four inches of vermiculite concrete, or two inches of insulation board.

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